Improvement in roll and pitch indicators for vessels



R; CHANDLER.,

Y R011 andr Pitch Indicator for Vessels.

No. 204,133. Patented May 28,1878.

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UNITED STATES.l PATENT OEEIcE'.A

RALPH CHANDLER, OF BOSTON, MASSACHUSETTS, ASSIGNOR T O HIMSELF AND WALTON BROTHERS, OF NEW YORK CITY.

IMPROVEMENT IN ROLL AND PITCH INDICATORS FOR VESSELS.

' Specification forming part of Letters Patent No. 204,133, dated May 2S, 1878 application filed May 13, 1878.

that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of lreference marked thereon, which form a part of this specification.

The nature of my invention consists in the construction and arrangement of a device for indicating the roll and pitch of vessels, as will be hereinafter more fully set forth.

In the annexed drawing, Figure l is a side elevation. Fig. 2 is a vertical section on line y y, Fig. 1, and Fig. 3 is an enlarged detail View of my invention.

A represents ametal bar, of suitable dimensions, which is to-be securely fastened to a beam or the ceiling of the cabin, or the captains or the navigators office, or any other desired part of a vessel. lFrom this bar depends a quadrant, VB, which is firmly secured to the bar, and stands in its plane at right angles with the plane of said bar. The arc of the quadrant B is slotted, and through the same is passed the arc ,of another'quadrant, C, the arms of which are pivoted to a block, D', by means of a pin or bolt, a; and this block is pivoted by a pin or bolt, b, between the arms of the quadrant B, the two pivotbolts running at right angles with each other,

-so thaty the quadrant C can swing in any direction. In other words, the quadrant C is connected to the stationary quadrant B by a universal joint. 1

The arcs of the two quadrants are vgraduated from the center toward both ends, and the upper edge or surface of each arc is formed with two series of teeth, x x, running on each arc from the center in opposite directions toward both ends. On each side of these rows of teeth isv formed a shoulder or way, d, as shown.

On each arc are hung twol stirrups, D D,

one on each side of the center, and in the lower end of each stirrup is pivoted a Weight, E. Through the upper end of each stirrup D is passed a pin, fi, upon which, withinthe stirrup, ispivoted a hook, G, which projects outward from the center of thearc and over the teeth x, so as to catch thereon. On each side of the hook G on the pin t' is a small wheel or roller, h, which runs on the shoulder or way d of the arc.

The indicator, thus constructed, being secured in the desired place, the arcs of the two quadrants should cross each other in the center, and the stirrups D are all moved close to the center.

The quadrant B, being stationary, will follow the motions of the vessel, both rolling and pitching, While the quadrant C, being suspended by a universal joint, will hang in a perpendicular position, and hence the stirrups D will ,be moved outward upon their respective arcs, more or less, according to the amount of the roll and pitch of the vessel. As the stirrups are being thus moved, their hooks engage with the teeth w, and hold them so that they will not move back toward the center, but remain at the farthest points on the arcs to which they have been moved. Hence the navigator can at any time see the greatest extent of the roll and pitch of the vessel.

.Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of a graduated stationary quadrant, B, a graduated quadrant, C, united thereto by a universal joint, and stirrups D,placed loosely upon the arcs of the quadrants, for the purposes herein set forth.

2. The stirrup D, provided with hinged weight E, pin i, rollers It h, and hook G, in combination with the arc of a quadrant having teeth .r and ways d, substantially as and for the purposes herein set forth.

In testimony that I claim the foregoingk as my ownI afx my signature in presence of two witnesses.

RALPH CHANDLER.

Witnesses A. H. VAIL, EDWD. GRONIN. 

